Lock



Jan. 26, 1932.v J. J. MURPHY 1,842,559

LOCK

Filed Feb. 21, 1929 ATTORNEYS. J

Patented Jan. 26, 1932 UNITED STATES PATENT OFFECE JAMES J". MURPHY, F TERRYVILLE, CONNECTICUT, ASSIGNOR TO EAGLE LOCK` CO., OF NEW YORK, N. Y., A. CORPORATION OF CONNECTICUT LOCK Application lerl February 21, 1929.

My invention relates to locks, and has special rei'erence to locks of the shackle type in which the arms of the shackle are adapted to be inserted through apertures in the lock case and adjust-ably held therein by lock mechamsm.

The principal object of my invention is to provide a lock of the shackle type which is ot simple, cheap and strong construction, and which otherwise meets all the requirements ol a lock oi this character.

This and other objects oi the invention and features whereby they may be attained, will p he clearly understood from the following description and accompanying drawings, in which:

Figure 1 is a front view, partly in section, of the lock with a part of the casing thereof removed so as to show the lock mechanism, this mechanism being shown by full lines in unlocked position and by broken lines in locked position;

Figs. 2, 3 and fl are sectional views taken on the lines 2-2, 3 3 and 4 4, respectively, oi Fig. 1;

Fig. 5 is a detail view showing the several key-operable tumblers of the lock in front elevation, the tumblers being removed from the lock and separated; and

Fig. 6 is a front View of a key for the lock.

My improved lock, as illustrated in the drawings, is provided with the usual shackle having the inner sides ot its arms provided with ratchet teeth t, and a lock case 6 having =i vertical apertures therein through which the arms of the shackle are adapted to be inserted. The lock case is made in two parts arranged one back of the other, and secured together by means of posts 8 integral with one of the parts and riveted to the other part.

The lock mechanism comprises two dogs 10 that are mounted to slide in a horizontal guideway formed by a rib 12 on the back part ot the lock case, and by opposed ribs 111 on the two parts ot the lock case. Each dog l() provided with a shank portion 16 and a head 1S, the Shanks ot the two dogs being arranged one back of the other in sliding engagement and the heads 18 extending transversely of the lock ease, each head extending Serial No. 341,614.

over the inner end of the shank of the other dog. The two dogs are pressed outwardly by means of springs 2() coiled about pins 22, the ends of each spring being mounted in sockets in the inner end of the shank of each dog and the head of the other dog; The underside ot the heads of the dogs 10 are flat so that when the dogs are shifted into engagement with the ratchet teeth on the arms of the shackle Q, the shackle is prevented from being withdrawn. The top side of the head of each dog is curved so as to permit the arms of the shackle, even when the dogs are in their projected positions, to beinserted the desired distance into the lock case, the springs 22 permitting the necessary retraction and projection of the dogs during the insertion of the shackle.

The inner side of the shank of each dog 10 is provided with a slot 24 which receives an upwardly proj ecting tongue 26 formed on the upper end of a key-operable tumbler Q8, the two tumblers 28 being pivotally mounted at 'their lower ends on a pin 30 secured to the back part of the lock case. The two tumblers 28 are provided with suitable openings 82 for receiving a key 34, so that upon turning the key in a clockwise direction the tumblers are turned in opposite directions and through their tongue and slot connections with the respective dogs serve to retract the dogs from holding engagement with the arms oi' the shackle, thus unlocking the shackle to permit it to be removed. Upon turning the key in a counter-clockwise direction the tumblers Q8 are turned so as to project the dogs 10 into position to engage the teeth of the shackle.

In addition to the tumblers 28,*the lock mechanism is provided with a tumbler 36 havingits key-receiving opening 38 so shaped as to limit the turning movement oit the key to ninety degrees. Also, the lock mechanism is provided with tumblers 40 having theirI key-receiving openings so formed as to permit removal of the key only when the dogs are in locking position.

The key is guided into operative engagement with the tumblers by Ineansof a guideway or key-hole 'formed in a ianged disk 12` extending through an aperture in the front wall of the lock case, the key-hole being provided with the usual swivel cover 44.

Vith this construction it will be apparent that to unlock the lock so as to permit removal of the shackle, the key is given a. quarter turn in a clockwise direction which through the tumblers 28 retracts the dogs from the teeth of the shackle. To move the dogs into locking position, the key is given a quarter` turn in the opposite direction whereupon the key may be removed. Y

The provision of the tumblers 36 and 40 for respectively limiting the turning movement of the key and preventing the key from being removed except when the dogs are in locking position, insures that the shackle` will be locked in position when inserted in the lock-.and the key removed.

Arms 46.v of spring sheet metal, transversely curved as shown, have their upper portions riveted at 48 to the back part of the lock case and have their lower free ends normally projecting; into the path of the shackle arms, Then the shackle is inserted through the proper end of the lock case as shown in Fig. l, the ends of its arms will force the spring arms 46 outward-ly so as to permit them to slide over said spring arms. In case, however, it were attempted to insert the shackle into the wrong endV of the lock case, the ends of the shackle arms would strike the free ends of the spring arms 46 and thus further insertion of the shackle arms would be positively prevented.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereo-f'or the scope of the appended claims.

VVhatI claim is: 1-. A lock' ofthe class described having, in combination, a shackle, a lock case through which the arms of the shackle may be inserted, dogs adapted to be shifted into and out ofV engagement with the shackle arms,

- key operable tumblers for thus shifting said key operable tumblers. mounted in thelock case and each adapted to be moved in opposite directions upon turning the key in oppositedirec-tions respectively, the two tumblers being thus moved simultaneously but in opposite directions, and means comprising tongue and slot connections between said dogs and tumblers for shifting said dogs into and outof engagement with the shackle arms upon turningthe key-in opposite directions, respectively, and tumblers serving to prevent re- ,in opposite directions, and means comprising tongue and slot connections between said dogs and tumblers for shifting said dogs into and out of engagement with the shackle arms upon respectively turning the key in opposite directions, and springs vtending to shift saidl dogs into engagement withv said arms, and

tumblers serving to prevent removal of the key except when the dogs are in shackle engaging position.

4. A lock of the class described having, in combination, a shackle, a lock case through which the arms of the shackle may be inserted, dogs adapted to be respectively shifted' into and out of engagement with the shackle arms, a plurality of keyl operable tumblers pivotally mounted-in the lock case, each oftwo of said tumblers being adapted to be turned in opposite directions upon turning the key in opposite directions, said two tumblers being thus turned simultaneously but in opposite directions, and means comprising tongue and slot connections'between said dogs and tumblers for shifting said dogs into and out of engagement with the shackle arms upon turning the key in opposite directions, other of said tumblers serving to prevent removal of the key except when the dogs are in shackleV engaging position.

5. A lock of the class described having, in combination, a shackle, a lock case through which the arms of the shackle may beinserted dogs adapted to be respectively shifted into .and out of engagement with the shackle arms, a plurality of key'operable tumblers pivotallymounted in the lock case, each of two of said tumblers being adapted to be turned in opposite directions upon turningthe key in opposite directions, said two tumblers being thus turned simultaneously but in opposite directions, connections between said dogs and tumblers for shifting.

January, 1929.

JAMES J. MURPHY 

